Air Canada plans to cancel at least 500 flights through Friday and shut down operations completely by Saturday morning.

Air Canada said it remains available to continue negotiations with its flight attendants as it winds down operations ahead of a potential labor disruption.

Flight attendants are demanding better wages and compensation for unpaid work. Currently, Air Canada only compensates flight attendants for the time they are in the air, but its attendants are seeking pay for the work they do before take-off and after landing, too.